Compared with today, the temperature on Earth during its first half-billion years was probably
A) considerably warmer.
B) considerably colder.
C) about the same as today.
D) about the same as today on average, but the diurnal fluctuations were much greater.
Answer: A
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How do epithelial cells obtain their nutrients? a. Direct blood supply from an artery
b. Nutrients are delivered by macrophages. c. Direct blood supply from a vein. d. Diffusion from adjacent cells. e. Osmosis of nutrients from underlying tissue.
What animals are considered to be sessile?
a. Sponges b. Mussels c. Barnacles d. Corals
Amniocentesis is
a. a surgical means of repairing deformities. b. a form of chemotherapy that modifies or inhibits gene expression or the function of gene products. c. used in prenatal diagnosis to detect chromosomal mutations and metabolic disorders in embryos. d. a form of gene replacement therapy. e. all of these.
Species having wide geographic distributions generally encounter a broader range of physical environmental conditions than species whose distribution is more restricted
Indicate whether the statement is true or false